That's pretty amazing! If you stick the pic in a paint package and grab grey (120,120,120) and draw over it, the grey changes brightness in one's perception based on whether you're in the shadow or not. It's not a case of the surrounding pixels changing the 'colour', but the visual context.
Never seen that one before. David Coombes [EMAIL PROTECTED] ... > You mean this checker-board, where a white square in the shadow has > absolut the same color as a black square in the light? > > <http://images.google.de/images?q=checker+illusion&hl=de&btnG=Bilder-Suche> > > > Regards > > Karl
